Power-supply for a non linear load, especially for the magnetron of a microwave oven

• Main Author: LE VAN SUU, MAURICE
• Format: Patent
• Language: English; French; German
• Published: 09.06.1999
• Edition: 6
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS,e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USERAPPLICATIONS; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The power supply circuit is closely monitored and controlled, enabling use of reduced size transformer. The supply circuit for a non-linear load includes a resonant transformer (T) comprising a controlled switch (S) for delivering a high tension (Vm) to the terminals (B1, B2) of the load, deriving this from a low tension supply (Valim). A first further circuit (L12, R1, A1) provides a measurement signal (SM1) indicating the high tension supply, and a second circuit (20) provides a signal (SM2) indicating the low tension value. A third circuit (R3, C3, A3) provides a signal (SM3) indicating the ambient temperature of the transformer. A management circuit responds to these inputs to control the controlled switch according to a stored algorithm. L'invention concerne un dispositif d'alimentation d'une charge non linéaire, notamment un magnétron d'un four à micro-ondes, du type comportant un transformateur résonant, des moyens étant prévus pour tenir compte, dans une unité de gestion à logique floue, de la température ambiante du transformateur pour générer un paramètre d'un signal de commande d'un interrupteur commandé disposé au primaire du transformateur. Avantage : permet de réduire la taille du transformateur.